a factory makes pretzels. each mega-size bag of pretzels should weigh 2.5 lbs. the manager suspects the filling machine has been underfilling the bags. she randomly selects 27 bags and weighs them, calculating a sample mean of 2.38 lbs. with a sample standard deviation of 0.5 lbs. she performs a significance test using a significance level of a = 0.05 and calculates a t-value of -1.247. recommend a strategic decision for the factory manager.